Tried doing a variety of searches and also read thru the EFI sticky but could not find anything specific for the 2015 YZ450. My bike is 100% stock and I am looking to experiment with maps to broaden the low to mid transition without affecting (or even increasing over-rev)and allow 2nd and 3rd gear to pull a little farther. Personally I think the roll on power is pretty good (not barky). I only ride MX at the vet B level on east coast tracks which are mostly fairly fast tracks but usually end up pretty rutted on race day so cornering is very important. I have found one map recommended from Dirt Rider which leans out the fuel and advances the ignition that I plan to try but if anyone has some real world experience with different maps specific to a stock 2015 YZ450 I would certainly appreciate it.